Mamuju Regency is a regency (Indonesian: kabupaten Mamuju) of West Sulawesi province, Indonesia. The regency capital is at Karema, while Mamuju town is the capital of West Sulawesi. The population of the regency was 336,879 at the 2010 Census, but it was substantially reduced by the creation of the new Central Mamuju Regency which was cut out of it on 14 December 2012. The reduced Mamuju Regency covers an area of 4,979.89 km and had a population of 278,764 at the 2020 Census; the official estimate as at mid 2023 was 292,395 (comprising 149,395 males and 142,844 females).

The regency is divided into eleven districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census and 2020 Census, together with the official estimates for mid 2023. The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totalling 88 rural desa and 14 urban kelurahan), and its post code.

Kode Wilayah	Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post code
76.02.02	Tapalang	273.02	18,083	20,820	21,624	Galung	10	91551
76.02.13	Tapalang Barat (West Tapalang)	111.63	9,129	11,793	11,588	Dungkait	7	91552
76.02.01	Mamuju	247.48	55,105	64,696	67,575	Binanga	9	91511 - 91515
76.02.12	Simboro dan Kepulauan	132.73	23,200	36,063	39,517	Rangas	8	91512 - 91513
76.02.16	Kepulauan Balabalakang (Balabalakang Islands)	1.48	2,347	2,201	2,244	Pulau Salissingan (Salissingan Island)	2	91512
76.02.03	Kalukku	454.96	49,250	59,108	62,134	Kalukku	14	91561
76.02.07	Papalang	201.92	21,395	23,942	24,662	Topore	9	91565
76.02.08	Sampaga	110.83	13,986	15,925	16,487	Bunde	7	91563
76.02.11	Tommo	769.66	19,407	23,381	24,606	Campaloga	14	91564
76.02.04	Kalumpang	1,801.71	10,800	11,763	12,022	Kalumpang	13	91560
76.02.15	Bonehau	874.47	8,622	9,492	9,731	Bonehau	9	91562
	Totals	4,979.89	231,324	278,764	292,395	Karema	102

Notes: (a) including 3 kelurahan. (b) including offshore island of Pulau Karampuang to the north of the town. (c) including 5 kelurahan. (d) including 2 kelurahan.
(e) the Balabalakang Islands are a small group lying between West Sulawesi and East Kalimantan, and closer to the latter. (f) including 4 offshore islands.
(g) including 4 kelurahan. (h) excluding the 2010 population of those regencies split off in 2012 to form the new Central Mamuju Regency.

• Official website (in Indonesian)

2°41′S 118°54′E / 2.683°S 118.900°E / -2.683; 118.900